/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.it;

import org.apache.iotdb.it.env.EnvFactory;
import org.apache.iotdb.it.framework.IoTDBTestRunner;
import org.apache.iotdb.itbase.category.LocalStandaloneIT;
import org.apache.iotdb.rpc.TSStatusCode;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.junit.experimental.categories.Category;
import org.junit.runner.RunWith;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import static org.junit.Assert.*;

@RunWith(IoTDBTestRunner.class)
@Category({LocalStandaloneIT.class})
public class IoTDBEncodingIT {

    @Before
    public void setUp() throws Exception {
        EnvFactory.getEnv().initBeforeClass();
    }

    @After
    public void tearDown() throws Exception {
        EnvFactory.getEnv().cleanAfterClass();
    }

    @Test
    public void testSetEncodingRegularFailed() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute("CREATE TIMESERIES root.test1.s0 WITH DATATYPE=INT64,ENCODING=REGULAR");
            fail();
        } catch (SQLException e) {
            assertEquals(TSStatusCode.METADATA_ERROR.getStatusCode(), e.getErrorCode());
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderTS_2DIFF() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(
                    "CREATE TIMESERIES root.db_0.tab0.salary WITH DATATYPE=INT64,ENCODING=TS_2DIFF");
            statement.execute("insert into root.db_0.tab0(time,salary) values(1,1100)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(2,1200)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(3,1300)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(4,1400)");

            statement.execute("flush");

            int[] result = new int[]{1100, 1200, 1300, 1400};
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    int salary = resultSet.getInt("root.db_0.tab0.salary");
                    assertEquals(result[index], salary);
                    index++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderTS_2DIFFOutofOrder() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(
                    "CREATE TIMESERIES root.db_0.tab0.salary WITH DATATYPE=INT64,ENCODING=TS_2DIFF");
            statement.execute("insert into root.db_0.tab0(time,salary) values(1,1200)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(2,1100)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(7,1000)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(4,2200)");
            statement.execute("flush");

            int[] result = new int[]{1200, 1100, 2200, 1000};
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    int salary = resultSet.getInt("root.db_0.tab0.salary");
                    assertEquals(result[index], salary);
                    index++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderRLE() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute("CREATE TIMESERIES root.db_0.tab0.salary WITH DATATYPE=INT64,ENCODING=RLE");
            statement.execute("insert into root.db_0.tab0(time,salary) values(1,1100)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(2,1200)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(3,1300)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(4,1400)");
            statement.execute("flush");

            int[] result = new int[]{1100, 1200, 1300, 1400};
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    int salary = resultSet.getInt("root.db_0.tab0.salary");
                    assertEquals(result[index], salary);
                    index++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderRLEOutofOrder() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute("CREATE TIMESERIES root.db_0.tab0.salary WITH DATATYPE=INT64,ENCODING=RLE");
            statement.execute("insert into root.db_0.tab0(time,salary) values(1,1200)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(2,1100)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(7,1000)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(4,2200)");
            statement.execute("flush");

            int[] result = new int[]{1200, 1100, 2200, 1000};
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    int salary = resultSet.getInt("root.db_0.tab0.salary");
                    assertEquals(result[index], salary);
                    index++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderGORILLA() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(
                    "CREATE TIMESERIES root.db_0.tab0.salary WITH DATATYPE=INT64,ENCODING=GORILLA");
            statement.execute("insert into root.db_0.tab0(time,salary) values(1,1100)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(2,1200)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(3,1300)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(4,1400)");
            statement.execute("flush");

            int[] result = new int[]{1100, 1200, 1300, 1400};
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    int salary = resultSet.getInt("root.db_0.tab0.salary");
                    assertEquals(result[index], salary);
                    index++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderGORILLAOutofOrder() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(
                    "CREATE TIMESERIES root.db_0.tab0.salary WITH DATATYPE=INT64,ENCODING=GORILLA");
            statement.execute("insert into root.db_0.tab0(time,salary) values(1,1200)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(2,1100)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(7,1000)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(4,2200)");
            statement.execute("flush");

            int[] result = new int[]{1200, 1100, 2200, 1000};
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    int salary = resultSet.getInt("root.db_0.tab0.salary");
                    assertEquals(result[index], salary);
                    index++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderZIGZAG() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(
                    "CREATE TIMESERIES root.db_0.tab0.salary WITH DATATYPE=INT64,ENCODING=ZIGZAG");
            statement.execute("insert into root.db_0.tab0(time,salary) values(1,1100)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(2,1200)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(3,1300)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(4,1400)");
            statement.execute("flush");

            int[] result = new int[]{1100, 1200, 1300, 1400};
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    int salary = resultSet.getInt("root.db_0.tab0.salary");
                    assertEquals(result[index], salary);
                    index++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderZIGZAGOutofOrder() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(
                    "CREATE TIMESERIES root.db_0.tab0.salary WITH DATATYPE=INT64,ENCODING=ZIGZAG");
            statement.execute("insert into root.db_0.tab0(time,salary) values(1,1200)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(2,1100)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(7,1000)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(4,2200)");
            statement.execute("flush");

            int[] result = new int[]{1200, 1100, 2200, 1000};
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    int salary = resultSet.getInt("root.db_0.tab0.salary");
                    assertEquals(result[index], salary);
                    index++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderFREQ() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(
                    "CREATE TIMESERIES root.db_0.tab0.salary WITH DATATYPE=INT64,ENCODING=FREQ");
            statement.execute("insert into root.db_0.tab0(time,salary) values(1,1100)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(2,1200)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(3,1300)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(4,1400)");
            statement.execute("flush");

            int[] groundtruth = new int[]{1100, 1200, 1300, 1400};
            int[] result = new int[4];
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    int salary = resultSet.getInt("root.db_0.tab0.salary");
                    result[index] = salary;
                    index++;
                }
                assertTrue(SNR(groundtruth, result, groundtruth.length) > 40);
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderFREQOutofOrder() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(
                    "CREATE TIMESERIES root.db_0.tab0.salary WITH DATATYPE=INT64,ENCODING=FREQ");
            statement.execute("insert into root.db_0.tab0(time,salary) values(1,1200)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(2,1100)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(7,1000)");
            statement.execute("insert into root.db_0.tab0(time,salary) values(4,2200)");
            statement.execute("flush");

            int[] groundtruth = new int[]{1200, 1100, 2200, 1000};
            int[] result = new int[4];
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    int salary = resultSet.getInt("root.db_0.tab0.salary");
                    result[index] = salary;
                    index++;
                }
                assertTrue(SNR(groundtruth, result, groundtruth.length) > 40);
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderDictionary() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(
                    "CREATE TIMESERIES root.db_0.tab0.city WITH DATATYPE=TEXT,ENCODING=DICTIONARY");
            statement.execute("insert into root.db_0.tab0(time,city) values(1,\"Nanjing\")");
            statement.execute("insert into root.db_0.tab0(time,city) values(2,\"Nanjing\")");
            statement.execute("insert into root.db_0.tab0(time,city) values(3,\"Beijing\")");
            statement.execute("insert into root.db_0.tab0(time,city) values(4,\"Shanghai\")");
            statement.execute("flush");

            String[] result = new String[]{"Nanjing", "Nanjing", "Beijing", "Shanghai"};
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    String city = resultSet.getString("root.db_0.tab0.city");
                    assertEquals(result[index], city);
                    index++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testSetTimeEncoderRegularAndValueEncoderDictionaryOutOfOrder() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute(
                    "CREATE TIMESERIES root.db_0.tab0.city WITH DATATYPE=TEXT,ENCODING=DICTIONARY");
            statement.execute("insert into root.db_0.tab0(time,city) values(1,\"Nanjing\")");
            statement.execute("insert into root.db_0.tab0(time,city) values(2,\"Nanjing\")");
            statement.execute("insert into root.db_0.tab0(time,city) values(4,\"Beijing\")");
            statement.execute("insert into root.db_0.tab0(time,city) values(3,\"Shanghai\")");
            statement.execute("flush");

            String[] result = new String[]{"Nanjing", "Nanjing", "Shanghai", "Beijing"};
            try (ResultSet resultSet = statement.executeQuery("select * from root.db_0.tab0")) {
                int index = 0;
                while (resultSet.next()) {
                    String city = resultSet.getString("root.db_0.tab0.city");
                    assertEquals(result[index], city);
                    index++;
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    public double SNR(int[] gd, int[] x, int length) {
        double noise_power = 0, signal_power = 0;
        for (int i = 0; i < length; i++) {
            noise_power += (gd[i] - x[i]) * (gd[i] - x[i]);
            signal_power += gd[i] * gd[i];
        }
        if (noise_power == 0) {
            return Double.POSITIVE_INFINITY;
        } else {
            return 10 * Math.log10(signal_power / noise_power);
        }
    }

    @Test
    public void testDoublePrecision1() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute("CREATE DATABASE root.turbine1");
            statement.execute(
                    "create timeseries root.turbine1.d1.s1 with datatype=DOUBLE, encoding=PLAIN, compression=SNAPPY");

            statement.execute("insert into root.turbine1.d1(timestamp,s1) values(1,1.2345678)");

            ResultSet resultSet = statement.executeQuery("select * from root.turbine1.**");

            String str = "1.2345678";
            while (resultSet.next()) {
                assertEquals(str, resultSet.getString("root.turbine1.d1.s1"));
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testDoublePrecision2() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute("CREATE DATABASE root.turbine1");
            statement.execute(
                    "create timeseries root.turbine1.d1.s1 with datatype=DOUBLE, encoding=RLE, compression=SNAPPY");

            statement.execute("insert into root.turbine1.d1(timestamp,s1) values(1,1.2345678)");

            ResultSet resultSet = statement.executeQuery("select * from root.turbine1.**");

            String str = "1.23";
            while (resultSet.next()) {
                assertEquals(str, resultSet.getString("root.turbine1.d1.s1"));
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testFloatPrecision1() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute("CREATE DATABASE root.turbine1");
            statement.execute(
                    "create timeseries root.turbine1.d1.s1 with datatype=FLOAT, encoding=PLAIN, compression=SNAPPY");

            statement.execute("insert into root.turbine1.d1(timestamp,s1) values(1,1.2345678)");

            ResultSet resultSet = statement.executeQuery("select * from root.turbine1.**");

            String str = "1.2345678";
            while (resultSet.next()) {
                assertEquals(str, resultSet.getString("root.turbine1.d1.s1"));
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }

    @Test
    public void testFloatPrecision2() {
        try (Connection connection = EnvFactory.getEnv().getConnection();
             Statement statement = connection.createStatement()) {
            statement.execute("CREATE DATABASE root.turbine1");
            statement.execute(
                    "create timeseries root.turbine1.d1.s1 with datatype=FLOAT, encoding=RLE, compression=SNAPPY");

            statement.execute("insert into root.turbine1.d1(timestamp,s1) values(1,1.2345678)");

            ResultSet resultSet = statement.executeQuery("select * from root.turbine1.**");

            String str = "1.23";
            while (resultSet.next()) {
                assertEquals(str, resultSet.getString("root.turbine1.d1.s1"));
            }
        } catch (Exception e) {
            e.printStackTrace();
            fail();
        }
    }
}
